Hi all!
I have a 2006 coupe
MY brakes lock up never at high speeds yet.
They have locked up on me backing out the drive way or pulling away from a green light, or when Im slowing down for a red light when i get to about 20 mph or slower. So it happens like that. Never done it when I'm just driving the flow of traffic speed, they never just lock up in that way.
And never do I get a code when that happens?
And it's very inconsistent It can happen once than days or weeks can go by nothing?

Anyone ever have that happen or know of someone that it has?
Help!

 

When this happens, does "ABS ACTIVE" or any other message appear briefly on the DIC?

 

I actually saw it last week say it was rebooting that Active handleing on the DIC, but the brakes never locked up though. It usually locks up after I'm stopped, then start to pull away I can't cause the brakes are locked up. I never get any codes after it does it?

 

Pull calipers off and inspect pads/pistons

 

Taking into the dealership tomarrow.
Will let you all know what they find out.

 

Do you telescope the steering wheel in and out often?

 

What did they find out?

 

I don't think I have telescope steering.
So my answer is no.

 

Remember I never got any codes, so they had nothing to go on to check that. They checked the lines the calibers etc. after checking the complete braking system,
They felt that the brake fluid was suspect because it was very polluted and had a green tint to the color. so they suggested that they evacuate all the brake fluid, and refill with all new fluid. I have done business with this Chevy dealership for years and actually have made friend with some of them. I trust them so I had them evacuate the system.
My vette only 30,000 miles on it. I bought the car from them also.
when I bought the car from them it only had 24,000. I know I'm the second owner. The car was very well taken care of because they gave me a lot of service records from previous owner.
So will see if it happens again. So far so good.
Thanks for all your help
Tim

 

I can't imagine that the brake fluid would have anything to do with these symptoms...at the same time though, changing the fluid was a very good idea...greenish is a bad color for brake fluid...LOL. Keep your eye on the DIC if it happens again and note any messages there. Good luck with it.

 

your TPMS sensor batteries are dieing, this triggers AH which applys the brakes all by itself via the computer.

install new TPMS sensors and your good to go.

 

It's never been my experience that the TPMS sensors, or the lack of them, can trigger ACTIVE HANDLING or anti-lock braking. A sensor's reporting a flat or a lack of a sensor's reporting may make it impossible to disable ACTIVE HANDLING or TRACTION CONTROL with the console button. I don't believe that a low or dead battery in a TPMS sensor can cause either system to lock up a wheel brake in a situation like the OP described.

 

Yeah, it doesn't make sense. Even a working TPMS sensor does not transmit continually, so much so that the system is designed to ignore missing TPMS sensors for quite a long time. And what would be the point of locking a wheel based on any input from a TPMS sensor, or lack thereof?

If anyone's AH stopped malfunctioning after replacing a TPMS sensor, I would attribute that to coincidence, or to bumping a connector during the wheel service.

 

its a known issue over in the autox/rr section. if the computer doesnt detect a wheel sensor it DOES activate AH and will apply the brakes by itself to slow the car to a safe speed (under 55 i believe)

i believe there is also a time limit of about 20 minutes.

a faulty SWPS sensor can also trigger this auto brake, (ask me how i know)

 

I don't think that's quite right.

The road course guys complain that after disabling AH with the button, it will turn back on if no TPMS signal is received after a while. This has the effect of AH suddenly intervening when the driver thought it was turned off, causing mayhem under track conditions.

So yes, a missing TPMS signal will turn AH back on, but that's not what the OP is complaining about. He has a car with locked up brakes at a stoplight.

I have also experienced the 55 mph warning with a missing TPMS signal and the car did not apply brakes, which would be a crazy thing to do. I cannot imagine that GM would implement such a dangerous feature when they could just limit the throttle - or not actually intervene at all, which was the case with my car.

 

When TPMS fails speed is limited to 55 mph IN TURNS. For some reason it will let you run at a higher speed on a straight but as soon as you hit a turn it will put the front brakes on to slow the car. Had this happen multiple times on my 08Z. Solution was to remove the connector to the steering sensor while on track. That shut down active handling. First time I had a solid tire pressure sensor failure the car braked hard while exiting Turn 4 at the Glen at a speed around 120 mph. The guy behind me almost hit me.

Bill

 

I think you have a problem with traction control. It could be a marginal signal coming from one of the rear hubs that makes the EBCM think a wheel is spinning.

The reason I say this is because of the experience I had with the systems on my 2003 Tahoe. The GM 800 truck series had an issue where ABS would fail due to corrosion around the ABS sensor mounts on the knuckles. My Tahoe was one of the early AWD/Stability Control/Traction Control vehicles and it had the same symptom you are talking about. Pull up to a traffic light and wouldn't be able to drive away or it would be very difficult to drive away. The fix was the same fix for the ABS problem: Clean the sensors.

You can't do that with the Corvette sensors since they are integral to the hub but I think when this happens the next time push the button on the console twice to turn off AH and TC and see what happens. It took the mechanics a long time to diagnose my Tahoe problem since it wouldn't do it when they had the vehicle so you may need to do a little playing around to see how you can stop it when it occurs. I had a similar problem on my 08 Malibu the mechanics couldn't fix but I was able to resolve the problem since after a while I could sense it starting to occur in the way the car felt. All I had to do to prevent it was reach over and turn off the stability/traction control for about 5 minutes and then turn it back on.

If using the console switch doesn't do anything then open the hood and pull both ABS fuses. That will shut down the EBCM. You will have some lights on the dash and 3 different service messages but that just means you don't have ABS/TC/AH. The car is still perfectly drivable. Just like a car from the era when they didn't have those features.

If that doesn't show where the problem is then it is going to take hooking up some of the dealership scan tools and driving the car around a while to see what is happening.

Bill

 

cycle through the info on the DIC. If it shows all the pressures for all the tires, Its most likely not the tpms. Look at all the pressures to make sure they register accurately. If not you may need a new TPMS. IF not all the tires register, you will need tpms as well. I have seem my tpms stop reading on the car because I delivered them in my Tahoe and they somehow lost programing to the vette and started reading to the Tahoe. So get them re-learned and see what happens.

I have experienced plenty of high speed and hard turn computer tire lock up but never at slow speed. Good Luck